Which of the following is most useful in representing population growth on a graph?

a. Logarithmic reproduction of the growth curve

b. A semilogarithmic graph using a log scale on the y-axis

c. An arithmetic graph of the lag phase followed by a logarithmic section for the log, stationary, and death phases

d. None of the above would best represent a population growth curve

Chemolithotrophs acquire electrons from (organic/inorganic)___________ compounds.

Which of the following methods is best for counting fecal bacteria from a stream to determine the safety of the water for drinking?

a. Dry weight

b. Turbidity

c. Viable plate counts

d. Membrane filtration

How does a chemostat maintain a constant population size?

A Coulter counter is a(n):

a. Statistical estimation using 15 dilution tubes and a table of numbers to estimate the number of bacteria per milliliter

b. Indirect method of counting microorganisms

c. Device that directly counts microbes as they pass through a tube in front of an electronic detector

d. Device that directly counts microbes that are differentially stained with fluorescent dyes

Lyophilization can be described as:

a. Freeze-drying

b. Deep-freezing

c. Refrigeration

d. Pickling

Quorum sensing is:

a. The ability to respond to changes in population density

b. A characteristic allowing secretion of a matrix

c. Dependent on direct contact among cells

d. Associated with colonies in broth culture